﻿using System;
using System.Diagnostics;
using System.Globalization;
using System.Runtime.InteropServices;
using System.ComponentModel.Design;
using Microsoft.Win32;
using Microsoft.VisualStudio;
using Microsoft.VisualStudio.Shell.Interop;
using Microsoft.VisualStudio.OLE.Interop;
using Microsoft.VisualStudio.Shell;
using Microsoft.VisualStudio.ComponentModelHost;
using EnvDTE;
using EnvDTE80;
using System.Linq;

namespace UWCSE.CompleterVSPackage
{
    /// <summary>
    /// This is the class that implements the package exposed by this assembly.
    ///
    /// The minimum requirement for a class to be considered a valid package for Visual Studio
    /// is to implement the IVsPackage interface and register itself with the shell.
    /// This package uses the helper classes defined inside the Managed Package Framework (MPF)
    /// to do it: it derives from the Package class that provides the implementation of the 
    /// IVsPackage interface and uses the registration attributes defined in the framework to 
    /// register itself and its components with the shell.
    /// </summary>
    // This attribute tells the PkgDef creation utility (CreatePkgDef.exe) that this class is
    // a package.
    [PackageRegistration(UseManagedResourcesOnly = true)]
    // This attribute is used to register the informations needed to show the this package
    // in the Help/About dialog of Visual Studio.
    [InstalledProductRegistration("#110", "#112", "1.0", IconResourceID = 400)]
    // This attribute is needed to let the shell know that this package exposes some menus.
    [ProvideMenuResource("Menus.ctmenu", 1)]
    // This attribute registers a tool window exposed by this package.
    [ProvideToolWindow(typeof(CompletionsToolWindow))]
    [Guid(GuidList.guidCompleterVSPackagePkgString)]
    // Load in NoSolution context (i.e. before any solutions load)
    [ProvideAutoLoad("ADFC4E64-0397-11D1-9F4E-00A0C911004F")]
    public sealed class CompleterVSPackagePackage : Package
    {
        /// <summary>
        /// Default constructor of the package.
        /// Inside this method you can place any initialization code that does not require 
        /// any Visual Studio service because at this point the package object is created but 
        /// not sited yet inside Visual Studio environment. The place to do all the other 
        /// initialization is the Initialize method.
        /// </summary>
        public CompleterVSPackagePackage()
        {
            Trace.WriteLine(string.Format(CultureInfo.CurrentCulture, "Entering constructor for: {0}", this.ToString()));
        }

        private CompletionsToolWindow GetToolWindow()
        {
            // Get the instance number 0 of this tool window. This window is single instance so this instance
            // is actually the only one.
            // The last flag is set to true so that if the tool window does not exists it will be created.
            ToolWindowPane window = this.FindToolWindow(typeof(CompletionsToolWindow), 0, true);
            if ((null == window) || (null == window.Frame))
            {
                throw new NotSupportedException(Resources.CanNotCreateWindow);
            }
            var compWindow = (CompletionsToolWindow)window;

            return compWindow;
        }
        private CompletionsControl GetCompletionsControl()
        {
            return GetToolWindow().GetCompletionsControl();
        }

        /// <summary>
        /// This function is called when the user clicks the menu item that shows the 
        /// tool window. See the Initialize method to see how the menu item is associated to 
        /// this function using the OleMenuCommandService service and the MenuCommand class.
        /// </summary>
        private void ShowToolWindow(object sender, EventArgs e)
        {
            GetToolWindow().DoCompletionAction();

            //IVsWindowFrame windowFrame = (IVsWindowFrame)window.Frame;
            //Microsoft.VisualStudio.ErrorHandler.ThrowOnFailure(windowFrame.Show());
        }

        private void ShowQueryWindow(object sender, EventArgs e)
        {
            GetCompletionsControl().ShowQueryWindow();
        }


        /////////////////////////////////////////////////////////////////////////////
        // Overriden Package Implementation
        #region Package Members

        /// <summary>
        /// Initialization of the package; this method is called right after the package is sited, so this is the place
        /// where you can put all the initilaization code that rely on services provided by VisualStudio.
        /// </summary>
        protected override void Initialize()
        {
            Trace.WriteLine(string.Format(CultureInfo.CurrentCulture, "Entering Initialize() of: {0}", this.ToString()));
            base.Initialize();

            // Add our command handlers for menu (commands must exist in the .vsct file)
            OleMenuCommandService mcs = GetService(typeof(IMenuCommandService)) as OleMenuCommandService;
            if (null != mcs)
            {
                // Create the command for the tool window
                CommandID toolwndCommandID = new CommandID(GuidList.guidCompleterVSPackageCmdSet, (int)PkgCmdIDList.cmdidCompPExp);
                MenuCommand menuToolWin = new MenuCommand(ShowToolWindow, toolwndCommandID);
                mcs.AddCommand(menuToolWin);

                CommandID qwndCommandID = new CommandID(GuidList.guidCompleterVSPackageCmdSet,
                    (int)PkgCmdIDList.cmdidCompQWin);
                MenuCommand menuQWin = new MenuCommand(ShowQueryWindow, qwndCommandID);
                mcs.AddCommand(menuQWin);
            }

            EnvDTE80.Events2 events2;
            events2 = (EnvDTE80.Events2)((DTE)GetService(typeof(DTE))).Events;
            var windowVisibilityEvents = events2.WindowVisibilityEvents;
            windowVisibilityEvents.WindowShowing += windowVisibilityEvents_WindowShowing;
        }
        #endregion

        private void windowVisibilityEvents_WindowShowing(EnvDTE.Window window)
        {
            if (window.Type != vsWindowType.vsWindowTypeDocument)
            {
                if (new Guid(window.ObjectKind).Equals(new Guid(GuidList.guidToolWindowPersistanceString)))
                {
                    if (!GetCompletionsControl().IsReady)
                    {
                        window.Close();
                    }
                    EnvDTE80.Events2 events2;
                    events2 = (EnvDTE80.Events2)((DTE)GetService(typeof(DTE))).Events;
                    var windowVisibilityEvents = events2.WindowVisibilityEvents;
                    windowVisibilityEvents.WindowShowing -= windowVisibilityEvents_WindowShowing;
                }
            }
        }
    }
}
